EP1228306B1 - Fuel-injection valve comprising a swirl element - Google Patents

Fuel-injection valve comprising a swirl element Download PDF

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Publication number
EP1228306B1
EP1228306B1 EP01982155A EP01982155A EP1228306B1 EP 1228306 B1 EP1228306 B1 EP 1228306B1 EP 01982155 A EP01982155 A EP 01982155A EP 01982155 A EP01982155 A EP 01982155A EP 1228306 B1 EP1228306 B1 EP 1228306B1
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EP
European Patent Office
Prior art keywords
swirl
fuel injection
injection valve
swirl element
fuel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP01982155A
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German (de)
French (fr)
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EP1228306A1 (en
Inventor
Guenter Dantes
Detlef Nowak
Joerg Heyse
Michael Klaski
Wolfgang Mertzky
Matthias Waldau
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP1228306A1 publication Critical patent/EP1228306A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1853—Orifice plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/162—Means to impart a whirling motion to fuel upstream or near discharging orifices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size

Definitions

  • the invention relates to a fuel injection valve according to the preamble of claim 1.
  • Swirl-generating means located downstream of the valve seat are typically configured to introduce fuel into radially outer ends of swirl channels, which are then directed radially inwardly to a swirl chamber into which it enters with a tangential component. From the swirl chamber then exits the swirling fuel. From DE-OS 198 15 775 a fuel injection valve is already known in which downstream of the valve seat a swirl disk is provided which has such a flow course.
  • Examples of fuel injection valves with swirl elements upstream of the valve seat for example, WO 98/35159 or DE-OS 197 36 682.
  • the swirl elements are basically designed so that the fuel is supplied radially from the outside in the direction of the central valve seat.
  • a fuel injection valve in which a nozzle plate is provided downstream of the valve seat.
  • This nozzle plate has a plurality of Schaufelradä 21 arranged swirl pits, which are distributed annularly over the nozzle plate.
  • Each individual swirl depression has an inlet region from which the fuel with a partial radial component is transported in the direction of an annular gap with a larger diameter.
  • a fuel injection valve for fuel injection systems of internal combustion engines is already known, which is suitable for injecting fuel into two intake manifolds of an internal combustion engine in the direction of two intake valves.
  • the fuel injection valve has an actuator through which a valve member in the form of a valve needle, which cooperates with a fixed valve seat, which is formed on a valve seat body, for opening and closing the valve, is movable along a valve longitudinal axis.
  • a swirl element in the form of a cup-shaped attachment body is arranged downstream of the valve seat, which has an inlet region and four outlet openings.
  • the single inlet region is centrally provided in the swirl element, so that all swirl channels emanate from it to the corresponding outlet openings, through which fuel flows only radially from the inside to the outside.
  • Each swirl channel opens tangentially into exactly one circular swirl space, from which exactly one outlet opening is supplied with fuel.
  • the fuel injection valve is suitable for supplying individual intake valves with a plurality of fuel jets or for simultaneously supplying fuel to a plurality of intake valves of the internal combustion engine.
  • the fuel injection valve according to the invention with the characterizing features of claim 1 has the advantage that with him a very high Zerstäubungsgüte a fuel to be sprayed is achieved. As a consequence, with such an injection valve of an internal combustion engine u.a. reduces the exhaust emission of the internal combustion engine and also a reduction in fuel consumption can be achieved.
  • the swirl element is very simple and reliable attachable to the fuel injector. Due to the central flow of the swirl element, the required attachment points are far away from the valve seat, the subsequent outlet opening and the inlet area of the swirl element. Such an arrangement allows a reduction of the dead volume in the flow behind the valve seat. The risk of so-called post-splashes in engine operation is so greatly reduced because little or no fuel is stored in the inflow area.
  • the spray geometry lying radially further outward through the central flow of the swirl ducts may be advantageous in certain installation conditions, in particular when using the fuel injection valve for direct injection into the combustion chamber of a spark-ignition internal combustion engine, since in this way the risk of coking of the spray-off geometry is reduced.
  • the swirl element can be produced cost-effectively in a particularly simple manner.
  • a particular advantage is that the swirl elements can be reproduced in a very precise manner in very large quantities at the same time (high batchability).
  • the upstream layer is a cover layer with a central inlet opening which completely covers the swirl channels of a central swirl-generating layer.
  • the swirl generation layer is formed by a plurality of material regions, which predetermine the contours of the swirl channels due to their contouring and their geometric position relative to one another. Due to the electroplating process, the individual layers without separation or joints are built on each other so that they are homogeneous throughout Represent material. In this respect, "layers" are to be understood as mental aids.
  • FIG. 2 shows a plan view of a swirl element shown along line II in FIG. 1
  • FIG. 3 shows a noninventive embodiment of a fuel injection valve with a swirl element having an obliquely extending outlet opening
  • FIG 5 shows a longitudinal section through a swirl element produced by means of multilayer electroplating
  • FIG. 6 shows a cross-sectional view of a central swirl generation layer of the swirl element shown in FIG. 5.
  • FIG Figure 7 shows a second cross-sectional view of a central swirl generation layer by means of multilayer electroplating 8 shows a third cross-sectional view of a central swirl-producing layer of a swirl element produced by means of multilayer electroplating, and
  • FIG Figure 9 shows another embodiment of a fuel injection valve partially shown with a swirl element.
  • valve in the form of an injection valve for fuel injection systems of mixture-compression spark-ignition internal combustion engines partially and simplified.
  • the injector has a tubular valve seat carrier 1, in which a longitudinal opening 3 is formed concentrically to a valve longitudinal axis 2.
  • a valve needle 5 is arranged, which has a valve closing portion 7 at its downstream end.
  • the actuation of the injection valve takes place in a known manner, for example electromagnetically.
  • a schematically indicated electromagnetic circuit with a solenoid 10, an armature 11 and a core 12.
  • the armature 11 is connected to the valve closing portion. 7 opposite end of the valve needle 5 by z. B. connected by means of a laser weld and aligned with the core 12.
  • another excitable actuator e.g. a piezo stack to be used in a comparable fuel injection valve or the actuation of the axially movable valve member by a hydraulic pressure or servo pressure.
  • the guiding element 14 has at least one flow opening 15, through which fuel can flow from the longitudinal opening 3 in the direction of a valve seat to guide the valve needle 5 during the axial movement.
  • the example disc-shaped guide member 14 is fixedly connected to a valve seat body 16, for example by means of a circumferential weld.
  • the valve seat body 16 is, for example, tightly mounted by welding at the end of the valve seat carrier 1 facing away from the core 12.
  • the position of the valve seat body 16 determines the size of the stroke of the valve needle 5, since the one end position of the valve needle 5 is fixed at non-energized solenoid 10 by the system of the valve closing portion 7 at a downstream conically tapered valve seat surface 22 of the valve seat body 16.
  • the other end position of the valve needle 5 is fixed in the excited magnet coil 10, for example, by the system of the armature 11 to the core 12.
  • the path between these two end positions of the valve needle 5 thus represents the stroke.
  • the valve closing portion 7 cooperates with the frusto-conical valve seat surface 22 of the valve seat body 16 to form a sealing seat. Downstream of the valve seat surface 22, the valve seat body 16 has a central outlet opening 23.
  • a e.g. disc-shaped swirl element 25 On the valve seat body 16 downstream of the outlet opening 23 is a e.g. disc-shaped swirl element 25 is arranged, which is secured, for example, in turn, by welding to the valve seat body 16.
  • the swirl element 25 has a single central inlet region 27, which immediately follows the outlet opening 23 of the valve seat body 16 and which lies in the region of the valve longitudinal axis 2. Starting from this inlet region 27, at least one swirl duct 28 extends radially outwards, which opens into an outlet opening 29 of the swirl element 25 there.
  • the fuel injection valve is designed in particular as a so-called multi-hole valve ( Figure 4), which is particularly suitable for direct injection of fuel into a combustion chamber, not shown.
  • fuel injectors for the direct injection of fuel into a combustion chamber whose outlet openings directly exposed to the combustion chamber atmosphere are strongly prone to coke.
  • the fuel injection valve according to the invention is to be avoided to a large extent that coking deposits of the combustion chamber in the region of the outlet openings 29 enforce this and thus significantly change the injection quantities over the life of the valve.
  • the swirl element 25 is a disk-shaped component which is embodied as a spray-perforated disk and which is designed in two layers, at least in the region of the opening structure 27, 28, 29.
  • the upper, the valve seat body 16 facing position includes the central inlet portion 27 and the at least one swirl duct 28, while the lower layer of the opening structure of the outlet opening 29 is formed.
  • the swirl element 25 is made for example of a metal sheet, wherein the opening contours are introduced by means of stamping, embossing, erosion and / or laser drilling.
  • FIG. 2 shows a plan view of the swirl element 25 shown along the line II in FIG. 1. It becomes clear that the swirl channel 28 extends radially outward from the central inlet region 27 in order to open tangentially into a swirl chamber 30 that is offset from the valve longitudinal axis 2.
  • the opening contour of the upper layer of the swirl element 25 thus largely corresponds to a 6-shape or 9-shape.
  • the edges of the inlet region 27, the swirl channel 28 and the swirl chamber 30 are beveled, for example, so that for the swirl channel 28 a notched channel or V-shaped geometry can result, which is thus inwardly roof ridge-shaped.
  • the outlet opening 29 running parallel to the valve longitudinal axis 2 projects with an offset to the swirl duct 28.
  • FIGS. 3 and 4 show two further exemplary embodiments of spin elements 25 which are not according to the invention.
  • FIG. 3 shows a second exemplary embodiment of a fuel injection valve with a swirl element 25 having an obliquely extending outlet opening 29 in the same view as FIG. 1, so that the same reference symbols are used for matching components.
  • the outlet opening 29 at an angle ⁇ to the valve longitudinal axis 2, wherein the outlet opening 29 extends inclined so that it is directed in Abspritzides to the valve longitudinal axis 2.
  • the direction of inclination can also be reversed; a skewed formation of the outlet opening 29 is possible.
  • FIG. 4 shows another embodiment of a swirl element 25 with three swirl channels 28 in a plan view. From the central inlet region 27 now go from three swirl channels 28, which extend, for example, by 120 ° to each other radially outward. At each of its ends, each swirl channel 28 opens into a respective swirl chamber 30, from which in turn the swirling fuel can enter an outlet opening 29 and be sprayed from there.
  • the swirl channels 28 can also be distributed unevenly over the circumference.
  • the outlet openings 29 For a desired filling of the combustion chamber with fuel, the outlet openings 29 For example, be aligned with different angles to the valve longitudinal axis 2, wherein, for example, all outlet openings 29 in the downstream direction at angles away from the valve longitudinal axis 2 or are directed towards it.
  • FIG. 5 shows a longitudinal section through a first swirl element 25 produced by multilayer electroplating.
  • the disk-shaped swirl element 25 is formed, for example. of three galvanically deposited layers, layers or layers, which thus follow one another axially when installed.
  • the three layers of the swirl element 25 will hereinafter be referred to according to their function with inlet layer 35, swirl-generating layer 36 and bottom layer 37.
  • the upper inlet layer 35 has a larger outer diameter than the swirl-generating layer 36 and the bottom layer 37.
  • Such an outer contour is expedient for a simple and secure installation of the swirl element 25 into a receiving opening 39 of a receiving part 40 (FIG. 9).
  • the fuel flows into the swirl element 25 centrally via a central inlet region 27, which is designed as a circular inlet opening, in the upper inlet layer 35, which is otherwise a pure material layer. From there, it passes downstream into a central region 42 of the central swirl generation layer 36. From the central region 42, the fuel can flow unimpeded into, for example, four swirl channels 28 in the middle one Swirl generation layer 36 enter.
  • the swirl-generating layer 36 is constructed by electrodeposition in such a way that material regions 43 and opening regions (central region 42, swirl channels 28) alternate in a specific desired structure.
  • FIG. 6 shows a cross-sectional view of the middle swirl generation layer 36 of the swirl element 25 shown in FIG. 5 for a better understanding.
  • the inner material regions 43 are kinked wing-like or formed arcuate or parabolic, so that arise as gaps between the material regions 43, the swirl channels 28 in similarly bent form.
  • the swirl channels 28 are flowed through from the central region 42 to the outside, where the emerging from them fuel due to the channel design enters into an annular flow region 44, partly against the inner wall of an outer material region 43 'bounces and is set in rotation.
  • the annular flow region 44 is thus surrounded by the likewise annular material region 43 'outside.
  • an annular gap in the lower bottom layer 37 adjoins the annular flow region 44 of the middle swirl generation layer 36 as outlet opening 29.
  • the outlet opening 29 is thus outwardly offset from the central inlet region 27 of the swirl element 25.
  • FIGS. 7 and 8 show two further cross-sectional views of a central swirl-producing layer 36 of a multilayer galvanic machining element 25.
  • three inner material regions 43 are provided in the middle swirl-generating layer 36, which in turn are deposited in such a way between them formed swirl channels 28 extend hook-shaped and a fuel flowing through them a swirl component is impressed.
  • the outer annular material region 43 ' is embodied hexagonally on its inner side, for example, so that the annular flow region 44 is bounded by this hexagonal wall.
  • the inner material regions 43 run parallel to the wall sections of the hexagonal inner side of the outer material region 43 '.
  • the material regions 43 of the swirl generation layer 36 of the swirl element 25 according to FIG. 8 are shaped in such a way that approximately the center of each individual outwardly pointing boundary surface 45 of the material regions 43 faces a corner point of the hexagonal inner side of the outer material region 43 '.
  • FIG. 9 shows a further exemplary embodiment of a partially illustrated fuel injection valve with a swirl element 25.
  • This swirl element 25 has a considerable difference compared with all previously described exemplary embodiments.
  • the bottom layer 37 of the swirl element 25 is designed with a smaller outer diameter than the outer diameter of the overlying swirl-generating layer 36 and has no outlet opening 29.
  • an inwardly standing collar 46 is provided on the receiving part 40 at the level of the bottom layer 37 of the swirl element 25. This collar 46 engages under the swirl element 25 on the swirl-generating layer 36 and reaches dimensionally accurate close to the bottom layer 37 zoom. Between the bottom layer 37 and the collar 46 remains a narrow gap which forms the outlet opening 29 as an annular gap.
  • the fastening possibilities of the receiving part 40 and of the swirl element 25 in the receiving part 40 with (laser) welds shown in FIG. 9 are correspondingly also applicable to attachment of the swirl elements 25 of FIGS. 5 to 8.
  • the width of the outlet opening 29 designed as an annular gap can be adjusted so that the outlet opening 29 represents the throttling cross section with respect to the cross section of the swirl channels 28.
  • the flow accumulation that thereby takes place in the flow region 44 and the outlet opening 29 causes the velocity field to be homogenized over the circumference of the outlet opening 29. In this respect, local fuel quantity accumulations and strands can be avoided.
  • the width of the annular gap outlet opening 29 can be increased in relation to the swirl channel widths, so that 28 fuel clusters are caused in the regions of the swirl channels opening into the flow region 44.
  • the z. B. of metal (titanium, steel), silicon, glass or ceramic can be made.
  • At least one auxiliary layer is optionally initially applied to the carrier plate.
  • This is, for example, an electroplating starter layer (eg TiCuTi, CrCuCr, Ni), which is required for the electrical conduction for the subsequent microplating.
  • the application of the auxiliary layer happens z. B. by sputtering or by electroless metal deposition.
  • a photoresist photoresist
  • the thickness of the photoresist should correspond to the thickness of the metal layer which is to be realized in the subsequent electroplating process, ie the thickness of the lower bottom layer 37 of the swirl element 25.
  • the resist layer may consist of one or more layers of a photoimageable film or a liquid resist (polyimide, Photoresist) exist. If, optionally, a sacrificial layer is to be electroplated into the later-produced resist structures, the thickness of the photoresist is to be increased by the thickness of the sacrificial layer.
  • the metal structure to be realized is to be transferred inversely in the photoresist by means of a photolithographic mask. One possibility is to expose the photoresist directly over the mask by means of UV exposure (printed circuit board imagesetter or semiconductor exposure device) (UV deep lithography) and subsequently to develop it.
  • the negative structure ultimately formed in the photoresist to the later layer 37 of the swirl element 25 is galvanically filled with metal (eg Ni, NiCo, NiFe, NiW, Cu) (metal deposition).
  • metal eg Ni, NiCo, NiFe, NiW, Cu
  • the metal adheres to the contour of the negative structure by electroplating, so that the predetermined contours are faithfully reproduced in it.
  • the steps from the optional application of the auxiliary layer must be repeated in accordance with the number of desired layers, so that two (lateral overgrowths) or three electroplating steps are carried out for a three-layer swirl element 25.
  • different metals can be used, but they can only be used in a new electroplating step.
  • the swirl elements 25 After depositing the upper inlet layer 35, the remaining photoresist is dissolved out of the metal structures by wet-chemical stripping. With smooth, passivated carrier plates (substrates), the swirl elements 25 can be detached from the substrate and singulated. For carrier plates with good adhesion of the swirl elements 25, the sacrificial layer is selectively etched away to substrate and swirl element 25, whereby the swirl elements 25 can be lifted off the carrier plate and separated.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Brennstoffeinspritzventil nach der Gattung des Anspruchs 1.The invention relates to a fuel injection valve according to the preamble of claim 1.

Es ist bereits vielfach bekannt, an Brennstoffeinspritzventilen drallerzeugende Elemente vorzusehen, mit denen dem abzuspritzenden Brennstoff eine Drallkomponente aufgeprägt wird, durch die der Brennstoff besser zerstäubt wird und in kleinere Tröpfchen zerfällt. Dabei ist es bereits bekannt, einerseits die drallerzeugenden Mittel stromaufwärts, also vor dem Ventilsitz und andererseits stromabwärts, also hinter dem Ventilsitz anzuordnen.It is already widely known to provide spin-on elements to fuel injection valves, with which the fuel to be sprayed a swirl component is impressed, through which the fuel is better atomized and disintegrates into smaller droplets. It is already known, on the one hand to arrange the swirl-producing means upstream, ie in front of the valve seat and on the other hand downstream, ie behind the valve seat.

Drallerzeugende Mittel, die stromabwärts des Ventilsitzes angeordnet sind, sind üblicherweise derart gestaltet, dass in radial außen liegende Enden von Drallkanälen Brennstoff eingeleitet wird, der dann radial einwärts zu einer Drallkammer geführt wird, in die er mit einer tangentialen Komponente eintritt. Aus der Drallkammer tritt dann der drallbehaftete Brennstoff aus. Aus der DE-OS 198 15 775 ist bereits ein Brennstoffeinspritzventil bekannt, bei dem stromabwärts des Ventilsitzes eine Drallscheibe vorgesehen ist, die einen solchen Strömungsverlauf aufweist.Swirl-generating means located downstream of the valve seat are typically configured to introduce fuel into radially outer ends of swirl channels, which are then directed radially inwardly to a swirl chamber into which it enters with a tangential component. From the swirl chamber then exits the swirling fuel. From DE-OS 198 15 775 a fuel injection valve is already known in which downstream of the valve seat a swirl disk is provided which has such a flow course.

Beispiele für Brennstoffeinspritzventile mit Drallelementen stromaufwärts des Ventilsitzes zeigen beispielsweise die WO 98/35159 oder die DE-OS 197 36 682. Auch bei diesen Ventilen sind die Drallelemente grundsätzlich so ausgeführt, dass der Brennstoff radial von außen in Richtung zum zentralen Ventilsitz zugeführt wird.Examples of fuel injection valves with swirl elements upstream of the valve seat, for example, WO 98/35159 or DE-OS 197 36 682. In these valves, the swirl elements are basically designed so that the fuel is supplied radially from the outside in the direction of the central valve seat.

Des weiteren ist bereits aus der DE-OS 195 27 626 ein Brennstoffeinspritzventil bekannt, bei dem stromabwärts des Ventilsitzes eine Düsenplatte vorgesehen ist. Diese Düsenplatte weist eine Vielzahl von schaufelradähnlich angeordneten Drallvertiefungen auf, die ringförmig über die Düsenplatte verteilt sind. Jede einzelne Drallvertiefung besitzt einen Einlassbereich, von dem aus der Brennstoff mit einer teilweise radialen Komponente in Richtung eines Ringspalts mit größerem Durchmesser transportiert wird.Furthermore, from DE-OS 195 27 626 a fuel injection valve is known in which a nozzle plate is provided downstream of the valve seat. This nozzle plate has a plurality of Schaufelradähnlich arranged swirl pits, which are distributed annularly over the nozzle plate. Each individual swirl depression has an inlet region from which the fuel with a partial radial component is transported in the direction of an annular gap with a larger diameter.

In der DE-OS 196 07 288 wurde bereits die sogenannte Multilayergalvanik zur Herstellung von Lochscheiben, die insbesondere für den Einsatz an Brennstoffeinspritzventilen geeignet sind, ausführlich beschrieben. Dieses Herstellungsprinzip einer Scheibenherstellung durch mehrfaches galvanisches Metallabscheiden verschiedener Strukturen aufeinander, so dass eine einteilige Scheibe vorliegt, soll ausdrücklich zum Offenbarungsgehalt vorliegender Erfindung zählen. Die mikrogalvanische Metallabscheidung in mehreren Ebenen, Lagen bzw. Schichten kann auch zur Herstellung der Drallscheiben zum Einsatz kommen.In DE-OS 196 07 288, the so-called multilayer electroplating for the production of perforated disks, which are particularly suitable for use on fuel injection valves, has already been described in detail. This production principle of a disk production by multiple galvanic metal deposition of different structures on each other, so that a one-piece disc is present, should expressly include the disclosure content of the present invention. The microgalvanic metal deposition in several levels, layers or layers can also be used for the production of the swirl disks.

Aus der DE 38 08 396 A1 ist bereits ein Brennstoffeinspritzventil für Brennstoffeinspritzanlagen von Brennkraftmaschinen bekannt, das zum Einspritzen von Brennstoff in zwei Saugrohre einer Brennkraftmaschine in Richtung zweier Einlassventile geeignet ist. Das Brennstoffeinspritzventil besitzt einen Aktuator, durch den ein Ventilteil in Form einer Ventilnadel, das zum Öffnen und Schließen des Ventils mit einem festen Ventilsitz zusammenwirkt, der an einem Ventilsitzkörper ausgebildet ist, entlang einer Ventillängsachse bewegbar ist. Außerdem ist stromabwärts des Ventilsitzes ein Drallelement in Form eines topfförmigen Vorsatzkörpers angeordnet, das einen Einlassbereich und vier Auslassöffnungen hat. Der einzige Einlassbereich ist in dem Drallelement zentral vorgesehen, so dass von ihm sämtliche Drallkanäle zu den entsprechenden Auslassöffnungen ausgehen, die von Brennstoff ausschließlich radial von innen nach außen durchströmt werden. Jeder Drallkanal mündet tangential in genau einen kreisförmigen Drallraum, von dem aus exakt eine Auslassöffnung mit Brennstoff versorgt wird. Das Brennstoffeinspritzventil eignet sich zur Versorgung einzelner Einlassventile mit mehreren Brennstoffstrahlen oder zur gleichzeitigen Brennstoffversorgung mehrerer Einlassventile der Brennkraftmaschine.From DE 38 08 396 A1 a fuel injection valve for fuel injection systems of internal combustion engines is already known, which is suitable for injecting fuel into two intake manifolds of an internal combustion engine in the direction of two intake valves. The fuel injection valve has an actuator through which a valve member in the form of a valve needle, which cooperates with a fixed valve seat, which is formed on a valve seat body, for opening and closing the valve, is movable along a valve longitudinal axis. In addition, a swirl element in the form of a cup-shaped attachment body is arranged downstream of the valve seat, which has an inlet region and four outlet openings. The single inlet region is centrally provided in the swirl element, so that all swirl channels emanate from it to the corresponding outlet openings, through which fuel flows only radially from the inside to the outside. Each swirl channel opens tangentially into exactly one circular swirl space, from which exactly one outlet opening is supplied with fuel. The fuel injection valve is suitable for supplying individual intake valves with a plurality of fuel jets or for simultaneously supplying fuel to a plurality of intake valves of the internal combustion engine.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Brennstoffeinspritzventil mit den kennzeichnenden Merkmalen des Anspruchs 1 hat den Vorteil, dass mit ihm eine sehr hohe Zerstäubungsgüte eines abzuspritzenden Brennstoffs erzielt wird. Als Konsequenz können mit einem solchen Einspritzventil einer Brennkraftmaschine u.a. die Abgasemission der Brennkraftmaschine reduziert und ebenso eine Verringerung des Brennstoffverbrauchs erzielt werden.The fuel injection valve according to the invention with the characterizing features of claim 1 has the advantage that with him a very high Zerstäubungsgüte a fuel to be sprayed is achieved. As a consequence, with such an injection valve of an internal combustion engine u.a. reduces the exhaust emission of the internal combustion engine and also a reduction in fuel consumption can be achieved.

In vorteilhafter Weise ist das Drallelement sehr einfach und zuverlässig an dem Brennstoffeinspritzventil befestigbar. Durch die zentrale Anströmung des Drallelements liegen die benötigten Befestigungsstellen weit abseits des Ventilsitzes, der darauf folgenden Auslassöffnung und des Einlassbereichs des Drallelements. Eine solche Anordnung ermöglicht eine Reduzierung des Totvolumens in der Anströmung hinter dem Ventilsitz. Die Gefahr sogenannter Nachspritzer im motorischen Betrieb wird so stark reduziert, da nur wenig oder kein Brennstoff in dem Zuströmbereich gespeichert wird.Advantageously, the swirl element is very simple and reliable attachable to the fuel injector. Due to the central flow of the swirl element, the required attachment points are far away from the valve seat, the subsequent outlet opening and the inlet area of the swirl element. Such an arrangement allows a reduction of the dead volume in the flow behind the valve seat. The risk of so-called post-splashes in engine operation is so greatly reduced because little or no fuel is stored in the inflow area.

Die durch die zentrale Anströmung der Drallkanäle radial weiter außen liegende Abspritzgeometrie kann bei bestimmten Einbaubedingungen, insbesondere bei Verwendung des Brennstoffeinspritzventils zum direkten Einspritzen in den Brennraum einer fremdgezündeten Brennkraftmaschine vorteilhaft sein, da auf diese Weise die Gefahr einer Verkokung der Abspritzgeometrie herabgesetzt ist.The spray geometry lying radially further outward through the central flow of the swirl ducts may be advantageous in certain installation conditions, in particular when using the fuel injection valve for direct injection into the combustion chamber of a spark-ignition internal combustion engine, since in this way the risk of coking of the spray-off geometry is reduced.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Anspruch 1 angegebenen Brennstoffeinspritzventils möglich.The measures listed in the dependent claims advantageous refinements and improvements of the claim 1 fuel injector are possible.

Sehr einfach kann mit dem erfindungsgemäßen Brennstoffeinspritzventil ein schräges Abspritzen von Brennstoff unter einem Winkel γ zur Ventillängsachse erfolgen, das unter bestimmten Einbaubedingungen erforderlich sein kann. In dem Drallelement können schräg verlaufende Auslassöffnungen bereits einfach integriert sein, ohne dass ein Abspritzbauteil schräg am Einspritzventil montiert werden muss.Very simply, with the fuel injection valve according to the invention, an oblique spraying of fuel at an angle γ to the valve longitudinal axis can take place, which may be necessary under certain installation conditions. In the swirl element oblique outlet openings can already be easily integrated without an Abspritzbauteil must be mounted at an angle to the injection valve.

In besonders vorteilhafter Weise ist das Drallelement auf besonders einfache Art und Weise kostengünstig herstellbar. Ein besonderer Vorteil besteht darin, dass die Drallelemente in reproduzierbarer Weise äußerst präzise in sehr großen Stückzahlen gleichzeitig gefertigt werden können (hohe Batchfähigkeit). Besonders vorteilhaft ist es dabei, das Drallelement mittels der sogenannten Multilayergalvanik herzustellen. Aufgrund ihrer metallischen Ausbildung sind solche Drallelemente sehr bruchsicher und gut montierbar. Die Anwendung der Multilayergalvanik erlaubt eine extrem große Gestaltungsfreiheit, da die Konturen der Öffnungsbereiche (Einlassbereiche, Drallkanäle, Auslassöffnungen) in dem Drallelement frei wählbar sind.In a particularly advantageous manner, the swirl element can be produced cost-effectively in a particularly simple manner. A particular advantage is that the swirl elements can be reproduced in a very precise manner in very large quantities at the same time (high batchability). It is particularly advantageous to produce the swirl element by means of the so-called multilayer electroplating. Due to their metallic design such swirl elements are very shatterproof and easy to assemble. The use of multilayer electroplating allows an extremely large design freedom, since the contours of the opening areas (inlet areas, swirl channels, outlet openings) in the swirl element can be freely selected.

Besonders vorteilhaft ist es, das Drallelement bestehend aus drei Lagen bzw. Schichten aufzubauen, indem zwei oder drei Galvanikschritte zur Metallabscheidung vorgenommen werden. Dabei stellt die stromaufwärtige Schicht eine Deckelschicht mit einer zentralen Einlassöffnung dar, die die Drallkanäle einer mittleren Drallerzeugungsschicht vollständig abdeckt. Die Drallerzeugungsschicht wird von mehreren Materialbereichen gebildet, die aufgrund ihrer Konturgebung und ihrer geometrischen Lage zueinander die Konturen der Drallkanäle vorgeben. Durch den Galvanikprozess werden die einzelnen Schichten ohne Trenn- oder Fügestellen so aufeinander aufgebaut, dass sie durchgehend homogenes Material darstellen. Insofern sind "Schichten" als gedankliches Hilfsmittel zu verstehen.It is particularly advantageous to construct the swirl element consisting of three layers or layers by carrying out two or three electroplating steps for metal deposition. In this case, the upstream layer is a cover layer with a central inlet opening which completely covers the swirl channels of a central swirl-generating layer. The swirl generation layer is formed by a plurality of material regions, which predetermine the contours of the swirl channels due to their contouring and their geometric position relative to one another. Due to the electroplating process, the individual layers without separation or joints are built on each other so that they are homogeneous throughout Represent material. In this respect, "layers" are to be understood as mental aids.

Zeichnungdrawing

Ausführungsbeispiele der Erfindung sind in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 ein teilweise dargestelltes nicht erfindungsgemäßes Brennstoffeinspritzventil im Schnitt, Figur 2 eine Draufsicht auf ein in Figur 1 entlang der Linie I-I gezeigtes Drallelement, Figur 3 ein nicht erfindungsgemäßes Ausführungsbeispiel eines Brennstoffeinspritzventils mit einem eine schräg verlaufende Auslassöffnung aufweisenden Drallelement, Figur 4 ein nicht erfindungsgemäßes Ausführungsbeispiel eines Drallelements mit drei Drallkanälen in einer Draufsicht, Figur 5 einen Längsschnitt durch ein mittels Multilayergalvanik hergestelltes Drallelement, Figur 6 eine Ansicht einer mittleren Drallerzeugungsschicht des in Figur 5 geschnitten dargestellten Drallelements im Querschnitt, Figur 7 eine zweite Querschnittsansicht einer mittleren Drallerzeugungsschicht eines mittels Multilayergalvanik hergestellten Drallelements, Figur 8 eine dritte Querschnittsansicht einer mittleren Drallerzeugungsschicht eines mittels Multilayergalvanik hergestellten Drallelements und Figur 9 ein weiteres Ausführungsbeispiel eines teilweise dargestellten Brennstoffeinspritzventils mit einem Drallelement.Embodiments of the invention are shown in simplified form in the drawing and explained in more detail in the following description. FIG. 2 shows a plan view of a swirl element shown along line II in FIG. 1, FIG. 3 shows a noninventive embodiment of a fuel injection valve with a swirl element having an obliquely extending outlet opening, FIG 5 shows a longitudinal section through a swirl element produced by means of multilayer electroplating, FIG. 6 shows a cross-sectional view of a central swirl generation layer of the swirl element shown in FIG. 5. FIG. 7 shows a second cross-sectional view of a central swirl generation layer by means of multilayer electroplating 8 shows a third cross-sectional view of a central swirl-producing layer of a swirl element produced by means of multilayer electroplating, and FIG Figure 9 shows another embodiment of a fuel injection valve partially shown with a swirl element.

Beschreibung der AusführungsbeispieleDescription of the embodiments

In der Figur 1 ist als ein Ausführungsbeispiel ein Ventil in der Form eines Einspritzventils für Brennstoffeinspritzanlagen von gemischverdichtenden fremdgezündeten Brennkraftmaschinen teilweise und vereinfacht dargestellt. Das Einspritzventil hat einen rohrförmigen Ventilsitzträger 1, in dem konzentrisch zu einer Ventillängsachse 2 eine Längsöffnung 3 ausgebildet ist. In der Längsöffnung 3 ist eine Ventilnadel 5 angeordnet, die an ihrem stromabwärtigen Ende einen Ventilschließabschnitt 7 aufweist.In the figure 1 is shown as an embodiment, a valve in the form of an injection valve for fuel injection systems of mixture-compression spark-ignition internal combustion engines partially and simplified. The injector has a tubular valve seat carrier 1, in which a longitudinal opening 3 is formed concentrically to a valve longitudinal axis 2. In the longitudinal opening 3, a valve needle 5 is arranged, which has a valve closing portion 7 at its downstream end.

Die Betätigung des Einspritzventils erfolgt in bekannter Weise, beispielsweise elektromagnetisch. Zur axialen Bewegung der Ventilnadel 5 und damit zum Öffnen entgegen der Federkraft einer nicht dargestellten Rückstellfeder bzw. Schließen des Einspritzventils dient ein schematisch angedeuteter elektromagnetischer Kreis mit einer Magnetspule 10, einem Anker 11 und einem Kern 12. Der Anker 11 ist mit dem dem Ventilschließabschnitt 7 abgewandten Ende der Ventilnadel 5 durch z. B. eine mittels eines Lasers ausgebildete Schweißnaht verbunden und auf den Kern 12 ausgerichtet.The actuation of the injection valve takes place in a known manner, for example electromagnetically. For axial movement of the valve needle 5 and thus to open against the spring force of a return spring or closure of the injector, not shown, is a schematically indicated electromagnetic circuit with a solenoid 10, an armature 11 and a core 12. The armature 11 is connected to the valve closing portion. 7 opposite end of the valve needle 5 by z. B. connected by means of a laser weld and aligned with the core 12.

Anstelle des elektromagnetischen Kreises kann auch ein anderer erregbarer Aktuator, wie z.B. ein Piezostack, in einem vergleichbaren Brennstoffeinspritzventil verwendet werden bzw. das Betätigen des axial beweglichen Ventilteils durch einen hydraulischen Druck oder Servodruck erfolgen.Instead of the electromagnetic circuit, another excitable actuator, e.g. a piezo stack to be used in a comparable fuel injection valve or the actuation of the axially movable valve member by a hydraulic pressure or servo pressure.

Zur Führung der Ventilnadel 5 während der Axialbewegung dient eine Führungsöffnung 13 eines Führungselements 14. Das Führungselement 14 weist wenigstens eine Strömungsöffnung 15 auf, durch die Brennstoff aus der Längsöffnung 3 in Richtung zu einem Ventilsitz strömen kann. Das z.B. scheibenförmige Führungselement 14 ist beispielsweise mittels einer umlaufenden Schweißnaht fest mit einem Ventilsitzkörper 16 verbunden. Der Ventilsitzkörper 16 ist z.B. an dem dem Kern 12 abgewandten Ende des Ventilsitzträgers 1 durch Schweißen dicht montiert.The guiding element 14 has at least one flow opening 15, through which fuel can flow from the longitudinal opening 3 in the direction of a valve seat to guide the valve needle 5 during the axial movement. The example disc-shaped guide member 14 is fixedly connected to a valve seat body 16, for example by means of a circumferential weld. The valve seat body 16 is, for example, tightly mounted by welding at the end of the valve seat carrier 1 facing away from the core 12.

Die Stellung des Ventilsitzkörpers 16 bestimmt die Größe des Hubs der Ventilnadel 5, da die eine Endstellung der Ventilnadel 5 bei nicht erregter Magnetspule 10 durch die Anlage des Ventilschließabschnitts 7 an einer sich stromabwärts konisch verjüngenden Ventilsitzfläche 22 des Ventilsitzkörpers 16 festgelegt ist. Die andere Endstellung der Ventilnadel 5 wird bei erregter Magnetspule 10 beispielsweise durch die Anlage des Ankers 11 an dem Kern 12 festgelegt. Der Weg zwischen diesen beiden Endstellungen der Ventilnadel 5 stellt somit den Hub dar. Der Ventilschließabschnitt 7 wirkt mit der kegelstumpfförmigen Ventilsitzfläche 22 des Ventilsitzkörpers 16 zu einem Dichtsitz zusammen. Stromabwärts der Ventilsitzfläche 22 weist der Ventilsitzkörper 16 eine zentrale Auslassöffnung 23 auf.The position of the valve seat body 16 determines the size of the stroke of the valve needle 5, since the one end position of the valve needle 5 is fixed at non-energized solenoid 10 by the system of the valve closing portion 7 at a downstream conically tapered valve seat surface 22 of the valve seat body 16. The other end position of the valve needle 5 is fixed in the excited magnet coil 10, for example, by the system of the armature 11 to the core 12. The path between these two end positions of the valve needle 5 thus represents the stroke. The valve closing portion 7 cooperates with the frusto-conical valve seat surface 22 of the valve seat body 16 to form a sealing seat. Downstream of the valve seat surface 22, the valve seat body 16 has a central outlet opening 23.

An dem Ventilsitzkörper 16 ist stromabwärts der Auslassöffnung 23 ein z.B. scheibenförmiges Drallelement 25 angeordnet, das beispielsweise wiederum durch Schweißen an dem Ventilsitzkörper 16 befestigt ist. Das Drallelement 25 besitzt einen einzigen zentralen Einlassbereich 27, der unmittelbar der Auslassöffnung 23 des Ventilsitzkörpers 16 folgt und der im Bereich der Ventillängsachse 2 liegt. Von diesem Einlassbereich 27 ausgehend erstreckt sich wenigstens ein Drallkanal 28 radial nach außen, der dort in eine Auslassöffnung 29 des Drallelements 25 mündet.On the valve seat body 16 downstream of the outlet opening 23 is a e.g. disc-shaped swirl element 25 is arranged, which is secured, for example, in turn, by welding to the valve seat body 16. The swirl element 25 has a single central inlet region 27, which immediately follows the outlet opening 23 of the valve seat body 16 and which lies in the region of the valve longitudinal axis 2. Starting from this inlet region 27, at least one swirl duct 28 extends radially outwards, which opens into an outlet opening 29 of the swirl element 25 there.

Das Brennstoffeinspritzventil ist insbesondere als sogenanntes Mehrlochventil (Figur 4) ausgeführt, das sich insbesondere zum direkten Einspritzen von Brennstoff in einen nicht dargestellten Brennraum eignet.The fuel injection valve is designed in particular as a so-called multi-hole valve (Figure 4), which is particularly suitable for direct injection of fuel into a combustion chamber, not shown.

Insbesondere Brennstoffeinspritzventile für die Direkteinspritzung von Brennstoff in einen Brennraum, deren Austrittsöffnungen direkt der Brennraumatmosphäre ausgesetzt sind, sind stark verkokungsanfällig. Mit dem erfindungsgemäßen Brennstoffeinspritzventil soll in hohem Maße vermieden werden, dass Verkokungsablagerungen des Brennraums im Bereich der Auslassöffnungen 29 diese zusetzen und so die Einspritzmengen über die Lebensdauer des Ventils erheblich verändern.In particular, fuel injectors for the direct injection of fuel into a combustion chamber, whose outlet openings directly exposed to the combustion chamber atmosphere are strongly prone to coke. With the fuel injection valve according to the invention is to be avoided to a large extent that coking deposits of the combustion chamber in the region of the outlet openings 29 enforce this and thus significantly change the injection quantities over the life of the valve.

Bei dem Drallelement 25 handelt es sich um ein scheibenförmiges Bauteil, das als Spritzlochscheibe ausgeführt ist und das zumindest im Bereich der Öffnungsstruktur 27, 28, 29 zweilagig ausgebildet ist. Dabei beinhaltet die obere, dem Ventilsitzkörper 16 zugewandte Lage den zentralen Einlassbereich 27 und den wenigstens einen Drallkanal 28, während die untere Lage der Öffnungsstruktur von der Auslassöffnung 29 gebildet wird. Das Drallelement 25 ist beispielsweise aus einem Blech hergestellt, wobei die Öffnungskonturen mittels Stanzen, Prägen, Erodieren und/oder Laserbohren eingebracht werden.The swirl element 25 is a disk-shaped component which is embodied as a spray-perforated disk and which is designed in two layers, at least in the region of the opening structure 27, 28, 29. Here, the upper, the valve seat body 16 facing position includes the central inlet portion 27 and the at least one swirl duct 28, while the lower layer of the opening structure of the outlet opening 29 is formed. The swirl element 25 is made for example of a metal sheet, wherein the opening contours are introduced by means of stamping, embossing, erosion and / or laser drilling.

Figur 2 zeigt eine Draufsicht auf das in Figur 1 entlang der Linie I-I gezeigte Drallelement 25. Dabei wird deutlich, dass der Drallkanal 28 von dem zentralen Einlassbereich 27 radial nach außen verläuft, um in eine versetzt zur Ventillängsachse 2 liegende Drallkammer 30 tangential zu münden. Die Öffnungskontur der oberen Lage des Drallelements 25 entspricht damit weitgehend einer 6-Form bzw. 9-Form. Die Kanten des Einlassbereichs 27, des Drallkanals 28 und der Drallkammer 30 sind z.B. abgeschrägt, so dass sich für den Drallkanal 28 eine eingekerbte rinnen- bzw. v-förmige Geometrie ergeben kann, die also invers dachfirstförmig ist. Da der Drallkanal 28 tangential in die Drallkammer 30 mündet und die Auslassöffnung 29 mittig zur Drallkammer 30 angeordnet ist, von der sie ringförmig umgeben ist, liegt die parallel zur Ventillängsachse 2 verlaufende Auslassöffnung 29 mit einem Versatz zum Drallkanal 28 vor.FIG. 2 shows a plan view of the swirl element 25 shown along the line II in FIG. 1. It becomes clear that the swirl channel 28 extends radially outward from the central inlet region 27 in order to open tangentially into a swirl chamber 30 that is offset from the valve longitudinal axis 2. The opening contour of the upper layer of the swirl element 25 thus largely corresponds to a 6-shape or 9-shape. The edges of the inlet region 27, the swirl channel 28 and the swirl chamber 30 are beveled, for example, so that for the swirl channel 28 a notched channel or V-shaped geometry can result, which is thus inwardly roof ridge-shaped. Since the swirl duct 28 opens tangentially into the swirl chamber 30 and the outlet opening 29 is arranged centrally to the swirl chamber 30, by which it is surrounded annularly, the outlet opening 29 running parallel to the valve longitudinal axis 2 projects with an offset to the swirl duct 28.

Auf diese Weise wird einem die Drallkammer 30 durchströmenden Brennstoff eine Drallkomponente aufgeprägt.In this way, a swirl component is imparted to a fuel flowing through the swirl chamber 30.

Je nach Wunsch bezüglich der Strahlstrukturierung und/oder der Strahlhomogenität bzw. den Einbaubedingungen am Zylinderkopf einer Brennkraftmaschine und deren Brennraumbedingungen kann es sinnvoll sein, denDepending on the desire with respect to the beam structuring and / or the beam homogeneity or the installation conditions on the cylinder head of an internal combustion engine and the combustion chamber conditions, it may be useful to

Winkel der Auslassöffnung 29 zur Ventillängsachse 2 zu variieren. In den Figuren 3 und 4 sind zwei weitere Ausführungsbeispiele von nicht erfindungsgemäßen Drallelementen 25 dargestellt.Angle of the outlet opening 29 to the valve longitudinal axis 2 to vary. FIGS. 3 and 4 show two further exemplary embodiments of spin elements 25 which are not according to the invention.

Dabei zeigt Figur 3 ein zweites Ausführungsbeispiel eines Brennstoffeinspritzventils mit einem eine schräg verlaufende Auslassöffnung 29 aufweisenden Drallelement 25 in der gleichen Ansicht wie Figur 1, so dass für übereinstimmende Bauteile die gleichen Bezugszeichen verwendet sind. Bei diesem Beispiel weist die Auslassöffnung 29 einen Winkel γ zur Ventillängsachse 2 auf, wobei die Auslassöffnung 29 derart geneigt verläuft, dass sie in Abspritzrichtung zur Ventillängsachse 2 hin gerichtet ist. Die Neigungsrichtung kann jedoch auch umgekehrt sein; auch eine windschiefe Ausbildung der Auslassöffnung 29 ist möglich.FIG. 3 shows a second exemplary embodiment of a fuel injection valve with a swirl element 25 having an obliquely extending outlet opening 29 in the same view as FIG. 1, so that the same reference symbols are used for matching components. In this example, the outlet opening 29 at an angle γ to the valve longitudinal axis 2, wherein the outlet opening 29 extends inclined so that it is directed in Abspritzrichtung to the valve longitudinal axis 2. However, the direction of inclination can also be reversed; a skewed formation of the outlet opening 29 is possible.

Figur 4 zeigt ein weiteres Ausführungsbeispiel eines Drallelements 25 mit drei Drallkanälen 28 in einer Draufsicht. Von dem zentralen Einlassbereich 27 gehen nun drei Drallkanäle 28 aus, die z.B. um 120° versetzt zueinander radial nach außen verlaufen. An ihren Enden mündet jeder Drallkanal 28 in jeweils eine Drallkammer 30, von der wiederum der drallbehaftete Brennstoff in eine Auslassöffnung 29 eintreten und von dort abgespritzt werden kann. Die Drallkanäle 28 können auch ungleichmäßig über den Umfang verteilt sein. Für eine gewünschte Ausfüllung des Brennraums mit Brennstoff können die Auslassöffnungen 29 beispielsweise mit unterschiedlichen Winkeln zur Ventillängsachse 2 ausgerichtet sein, wobei sich z.B. alle Auslassöffnungen 29 in stromabwärtiger Richtung unter Winkeln von der Ventillängsachse 2 entfernen oder ihr zugewandt gerichtet sind.Figure 4 shows another embodiment of a swirl element 25 with three swirl channels 28 in a plan view. From the central inlet region 27 now go from three swirl channels 28, which extend, for example, by 120 ° to each other radially outward. At each of its ends, each swirl channel 28 opens into a respective swirl chamber 30, from which in turn the swirling fuel can enter an outlet opening 29 and be sprayed from there. The swirl channels 28 can also be distributed unevenly over the circumference. For a desired filling of the combustion chamber with fuel, the outlet openings 29 For example, be aligned with different angles to the valve longitudinal axis 2, wherein, for example, all outlet openings 29 in the downstream direction at angles away from the valve longitudinal axis 2 or are directed towards it.

In den Figuren 5 bis 9 sind Ausführungsbeispiele von Drallelementen 25 dargestellt, die nach dem gleichen Prinzip wie bei den Beispielen gemäß Figuren 1 bis 4 angeströmt und durchströmt werden, jedoch mittels der sogenannten Multilayergalvanik hergestellt sind.In the figures 5 to 9 embodiments of swirl elements 25 are shown, which are flowed and flowed through according to the same principle as in the examples according to figures 1 to 4, but are produced by means of the so-called multilayer electroplating.

Figur 5 zeigt einen Längsschnitt durch ein erstes mittels Multilayergalvanik hergestelltes Drallelement 25. Gebildet wird das scheibenförmige Drallelement 25 z.B. aus drei galvanisch aufeinander abgeschiedenen Ebenen, Lagen bzw. Schichten, die somit im eingebauten Zustand axial aufeinander folgen. Bezeichnet werden die drei Schichten des Drallelements 25 im folgenden entsprechend ihrer Funktion mit Einlassschicht 35, Drallerzeugungsschicht 36 und Bodenschicht 37. Die obere Einlassschicht 35 weist einen größeren Außendurchmesser als die Drallerzeugungsschicht 36 und die Bodenschicht 37 auf. Eine solche Außenkontur ist für einen einfachen und sicheren Einbau des Drallelements 25 in eine Aufnahmeöffnung 39 eines Aufnahmeteils 40 (Figur 9) zweckmäßig.FIG. 5 shows a longitudinal section through a first swirl element 25 produced by multilayer electroplating. The disk-shaped swirl element 25 is formed, for example. of three galvanically deposited layers, layers or layers, which thus follow one another axially when installed. The three layers of the swirl element 25 will hereinafter be referred to according to their function with inlet layer 35, swirl-generating layer 36 and bottom layer 37. The upper inlet layer 35 has a larger outer diameter than the swirl-generating layer 36 and the bottom layer 37. Such an outer contour is expedient for a simple and secure installation of the swirl element 25 into a receiving opening 39 of a receiving part 40 (FIG. 9).

Der Brennstoff strömt zentral über einen als kreisförmige Einlassöffnung ausgebildeten mittleren Einlassbereich 27 in der oberen Einlassschicht 35, die ansonsten eine reine Materialschicht ist, in das Drallelement 25 ein. Von dort gelangt er stromabwärts in einen zentralen Bereich 42 der mittleren Drallerzeugungsschicht 36. Von dem zentralen Bereich 42 aus kann der Brennstoff ungehindert in beispielsweise vier Drallkanäle 28 in der mittleren Drallerzeugungsschicht 36 eintreten. Die Drallerzeugungsschicht 36 ist durch galvanische Metallabscheidung derart aufgebaut, dass sich in einer bestimmten gewünschten Struktur Materialbereiche 43 und Öffnungsbereiche (zentraler Bereich 42, Drallkanäle 28) abwechseln. Figur 6 zeigt zum besseren Verständnis eine Ansicht der mittleren Drallerzeugungsschicht 36 des in Figur 5 geschnitten dargestellten Drallelements 25 im Querschnitt.The fuel flows into the swirl element 25 centrally via a central inlet region 27, which is designed as a circular inlet opening, in the upper inlet layer 35, which is otherwise a pure material layer. From there, it passes downstream into a central region 42 of the central swirl generation layer 36. From the central region 42, the fuel can flow unimpeded into, for example, four swirl channels 28 in the middle one Swirl generation layer 36 enter. The swirl-generating layer 36 is constructed by electrodeposition in such a way that material regions 43 and opening regions (central region 42, swirl channels 28) alternate in a specific desired structure. FIG. 6 shows a cross-sectional view of the middle swirl generation layer 36 of the swirl element 25 shown in FIG. 5 for a better understanding.

Die inneren Materialbereiche 43 sind flügelähnlich abgeknickt oder bogenförmig oder parabelförmig ausgebildet, so dass sich als Zwischenräume zwischen den Materialbereichen 43 die Drallkanäle 28 in ähnlich abgeknickter Form ergeben. Die Drallkanäle 28 werden vom zentralen Bereich 42 her nach außen hin durchströmt, wo der aus ihnen austretende Brennstoff aufgrund der Kanalgestaltung drallbehaftet in einen ringförmigen Strömungsbereich 44 eintritt, teilweise gegen die Innenwandung eines äußeren Materialbereichs 43` prallt und in Rotation versetzt wird. Der ringförmige Strömungsbereich 44 ist also von dem ebenfalls ringförmigen Materialbereich 43' außen umgeben. Bei dem in Figur 5 dargestellten Ausführungsbeispiel schließt sich an den ringförmigen Strömungsbereich 44 der mittleren Drallerzeugungsschicht 36 als Auslassöffnung 29 ein Ringspalt in der unteren Bodenschicht 37 an. Die Auslassöffnung 29 liegt damit nach außen hin versetzt zum zentralen Einlassbereich 27 des Drallelements 25 vor.The inner material regions 43 are kinked wing-like or formed arcuate or parabolic, so that arise as gaps between the material regions 43, the swirl channels 28 in similarly bent form. The swirl channels 28 are flowed through from the central region 42 to the outside, where the emerging from them fuel due to the channel design enters into an annular flow region 44, partly against the inner wall of an outer material region 43 'bounces and is set in rotation. The annular flow region 44 is thus surrounded by the likewise annular material region 43 'outside. In the exemplary embodiment illustrated in FIG. 5, an annular gap in the lower bottom layer 37 adjoins the annular flow region 44 of the middle swirl generation layer 36 as outlet opening 29. The outlet opening 29 is thus outwardly offset from the central inlet region 27 of the swirl element 25.

Figuren 7 und 8 zeigen zwei weitere Querschnittsansichten einer mittleren Drallerzeugungsschicht 36 eines mittels Multilayergalvanik hergestellten Drallelements 25. Bei diesen beiden Drallelementen 25 sind in der mittleren Drallerzeugungsschicht 36 drei innere Materialbereiche 43 vorgesehen, die wiederum so abgeschieden sind, dass die zwischen ihnen gebildeten Drallkanäle 28 hakenförmig verlaufen und einem sie durchströmenden Brennstoff eine Drallkomponente aufgeprägt wird. Der äußere ringförmige Materialbereich 43' ist an seiner Innenseite beispielsweise sechseckig ausgeführt, so dass der ringförmige Strömungsbereich 44 durch diese sechseckige Wandung begrenzt ist.FIGS. 7 and 8 show two further cross-sectional views of a central swirl-producing layer 36 of a multilayer galvanic machining element 25. In these two swirl elements 25, three inner material regions 43 are provided in the middle swirl-generating layer 36, which in turn are deposited in such a way between them formed swirl channels 28 extend hook-shaped and a fuel flowing through them a swirl component is impressed. The outer annular material region 43 'is embodied hexagonally on its inner side, for example, so that the annular flow region 44 is bounded by this hexagonal wall.

Im in Figur 7 dargestellten Beispiel verlaufen die inneren Materialbereiche 43 mit ihren nach außen hin zeigenden Begrenzungsflächen 45 parallel zu den Wandungsabschnitten der sechseckigen Innenseite des äußeren Materialbereichs 43'. Dagegen sind die Materialbereiche 43 der Drallerzeugungsschicht 36 des Drallelements 25 gemäß Figur 8 derart ausgeformt, dass jeweils ungefähr die Mitte jeder einzelnen nach außen hin zeigenden Begrenzungsfläche 45 der Materialbereiche 43 einem Eckpunkt der sechseckigen Innenseite des äußeren Materialbereichs 43' gegenüberliegt. Diese Strukturen der Drallerzeugungsschicht 36 sind in beliebiger Weise veränderbar.In the example shown in FIG. 7, the inner material regions 43, with their boundary surfaces 45 pointing outwards, run parallel to the wall sections of the hexagonal inner side of the outer material region 43 '. In contrast, the material regions 43 of the swirl generation layer 36 of the swirl element 25 according to FIG. 8 are shaped in such a way that approximately the center of each individual outwardly pointing boundary surface 45 of the material regions 43 faces a corner point of the hexagonal inner side of the outer material region 43 '. These structures of the swirl-generating layer 36 can be changed in any desired manner.

Figur 9 zeigt ein weiteres Ausführungsbeispiel eines teilweise dargestellten Brennstoffeinspritzventils mit einem Drallelement 25. Dieses Drallelement 25 weist gegenüber allen vorher beschriebenen Ausführungsbeispielen einen erheblichen Unterschied auf. Die Bodenschicht 37 des Drallelements 25 ist mit einem kleineren Außendurchmesser als dem Außendurchmesser der darüber liegenden Drallerzeugungsschicht 36 ausgeführt und besitzt keine Auslassöffnung 29. Statt dessen ist an dem Aufnahmeteil 40 in Höhe der Bodenschicht 37 des Drallelements 25 ein nach innen stehenden Kragen 46 vorgesehen. Dieser Kragen 46 untergreift das Drallelement 25 an der Drallerzeugungsschicht 36 und reicht maßgenau nahe bis an die Bodenschicht 37 heran. Zwischen der Bodenschicht 37 und dem Kragen 46 verbleibt ein schmaler Spalt, der als Ringspalt die Auslassöffnung 29 bildet. Die in Figur 9 gezeigten Befestigungsmöglichkeiten des Aufnahmeteils 40 sowie des Drallelements 25 in dem Aufnahmeteil 40 mit (Laser-)Schweißnähten sind entsprechend auch auf Befestigung der Drallelemente 25 der Figuren 5 bis 8 anwendbar.FIG. 9 shows a further exemplary embodiment of a partially illustrated fuel injection valve with a swirl element 25. This swirl element 25 has a considerable difference compared with all previously described exemplary embodiments. The bottom layer 37 of the swirl element 25 is designed with a smaller outer diameter than the outer diameter of the overlying swirl-generating layer 36 and has no outlet opening 29. Instead, an inwardly standing collar 46 is provided on the receiving part 40 at the level of the bottom layer 37 of the swirl element 25. This collar 46 engages under the swirl element 25 on the swirl-generating layer 36 and reaches dimensionally accurate close to the bottom layer 37 zoom. Between the bottom layer 37 and the collar 46 remains a narrow gap which forms the outlet opening 29 as an annular gap. The fastening possibilities of the receiving part 40 and of the swirl element 25 in the receiving part 40 with (laser) welds shown in FIG. 9 are correspondingly also applicable to attachment of the swirl elements 25 of FIGS. 5 to 8.

Die Weite der als Ringspalt ausgebildeten Auslassöffnung 29 kann so eingestellt werden, dass die Auslassöffnung 29 gegenüber dem Querschnitt der Drallkanäle 28 den drosselnden Querschnitt darstellt. Der dadurch in dem Strömungsbereich 44 und der Auslassöffnung 29 stattfindende Strömungsaufstau führt dazu, dass das Geschwindigkeitsfeld über den Umfang der Auslassöffnung 29 homogenisiert wird. Insofern lassen sich lokale Brennstoffmengenanhäufungen und Strähnen vermeiden. Sind jedoch gerade solche Strähnen für bestimmte Strahlbilder gewünscht, so kann die Weite der Ringspalt-Auslassöffnung 29 gegenüber den Drallkanalweiten vergrößert werden, so dass in den Bereichen der in den Strömungsbereich 44 ausmündenden Drallkanäle 28 Brennstoffanhäufungen verursacht werden.The width of the outlet opening 29 designed as an annular gap can be adjusted so that the outlet opening 29 represents the throttling cross section with respect to the cross section of the swirl channels 28. The flow accumulation that thereby takes place in the flow region 44 and the outlet opening 29 causes the velocity field to be homogenized over the circumference of the outlet opening 29. In this respect, local fuel quantity accumulations and strands can be avoided. However, if just such strands are desired for certain jet patterns, the width of the annular gap outlet opening 29 can be increased in relation to the swirl channel widths, so that 28 fuel clusters are caused in the regions of the swirl channels opening into the flow region 44.

Die Drallelemente 25 gemäß Figuren 5 bis 9 werden in mehreren metallischen Schichten beispielsweise durch galvanische Abscheidung aufgebaut (Multilayergalvanik). Aufgrund der tiefenlithographischen, galvanotechnischen Herstellung gibt es besondere Merkmale in der Konturgebung, von denen hiermit einige in Kurzform zusammenfassend aufgeführt sind:

  • Schichten mit über die Scheibenfläche konstanter Dicke,
  • durch die tiefenlithographische Strukturierung weitgehend senkrechte Einschnitte in den Schichten, welche die jeweils durchströmten Hohlräume bilden (fertigungstechnisch bedingte Abweichungen von ca. 3° gegenüber optimal senkrechten Wandungen können auftreten),
  • gewünschte Hinterschneidungen und Überdeckungen der Einschnitte durch mehrlagigen Aufbau einzeln strukturierter Metallschichten,
  • Einschnitte mit beliebigen, weitgehend achsparallele Wandungen aufweisenden Querschnittsformen,
  • einteilige Ausführung der Drallscheibe, da die einzelnen Metallabscheidungen unmittelbar aufeinander erfolgen.
The swirl elements 25 according to FIGS. 5 to 9 are constructed in several metallic layers, for example by means of electrodeposition (multilayer electroplating). Due to the deep lithographic, electroplating production, there are special features in the contouring, of which hereby some are summarized in short form:
  • Layers with over the disk surface of constant thickness,
  • by deep lithographic structuring largely vertical incisions in the layers, which each flow through cavities form (production-related deviations of about 3 ° with respect to optimally vertical walls can occur),
  • desired undercuts and overlaps of the incisions by multilayer construction of individually structured metal layers,
  • Incisions with any, largely axially parallel walls having cross-sectional shapes,
  • one-piece design of the swirl disk, since the individual metal deposits occur directly to each other.

In den folgenden Abschnitten wird nur in Kurzform das Verfahren zur Herstellung der Drallelemente 25 erläutert. Ausführlich wurden sämtliche Verfahrensschritte der galvanischen Metallabscheidung zur Herstellung einer Lochscheibe bereits in der DE-OS 196 07 288 beschrieben. Charakteristisch für das Verfahren der sukzessiven Anwendung von photolithographischen Schritten (UV-Tiefenlithographie) und anschließender Mikrogalvanik ist, dass es auch in großflächigem Maßstab eine hohe Präzision der Strukturen gewährleistet, so dass es ideal für eine Massenfertigung mit sehr großen Stückzahlen (hohe Batchfähigkeit) einsetzbar ist. Auf einem Nutzen oder Wafer kann eine Vielzahl von Drallelementen 25 gleichzeitig gefertigt werden.In the following sections, the method for producing the swirl elements 25 will be explained only in brief form. In detail, all the steps of the galvanic metal deposition for producing a perforated disc have already been described in DE-OS 196 07 288. Characteristic of the process of the successive application of photolithographic steps (UV deep lithography) and subsequent microplating is that it ensures a high precision of the structures even on a large scale, so that it is ideal for mass production with very large numbers (high batchability) can be used , On a utility or wafer, a plurality of spin elements 25 can be fabricated simultaneously.

Ausgangspunkt für das Verfahren ist eine ebene und stabile Trägerplatte, die z. B. aus Metall (Titan, Stahl), Silizium, Glas oder Keramik bestehen kann. Auf die Trägerplatte wird optional zunächst wenigstens eine Hilfsschicht aufgebracht. Dabei handelt es sich beispielsweise um eine Galvanikstartschicht (z. B. TiCuTi, CrCuCr, Ni), die zur elektrischen Leitung für die spätere Mikrogalvanik benötigt wird. Das Aufbringen der Hilfsschicht geschieht z. B. durch Sputtern oder durch stromlose Metallabscheidung. Nach dieser Vorbehandlung der Trägerplatte wird auf die Hilfsschicht ein Photoresist (Photolack) ganzflächig aufgebracht, z.B. aufgewalzt oder aufgeschleudert.Starting point for the process is a flat and stable support plate, the z. B. of metal (titanium, steel), silicon, glass or ceramic can be made. At least one auxiliary layer is optionally initially applied to the carrier plate. This is, for example, an electroplating starter layer (eg TiCuTi, CrCuCr, Ni), which is required for the electrical conduction for the subsequent microplating. The application of the auxiliary layer happens z. B. by sputtering or by electroless metal deposition. After this Pretreatment of the support plate, a photoresist (photoresist) is applied over the entire surface of the auxiliary layer, for example, rolled or spin coated.

Die Dicke des Photoresists sollte dabei der Dicke der Metallschicht entsprechen, die in dem später folgenden Galvanikprozess realisiert werden soll, also der Dicke der unteren Bodenschicht 37 des Drallelements 25. Die Resistschicht kann aus einer oder mehreren Lagen einer fotostrukturierbaren Folie oder einem Flüssigresist (Polyimid, Photolack) bestehen. Falls optional eine Opferschicht in die später erzeugten Lackstrukturen galvanisiert werden soll, ist die Dicke des Photoresists um die Dicke der Opferschicht zu vergrößern. Die zu realisierende Metallstruktur soll mit Hilfe einer photolithographischen Maske invers in dem Photoresist übertragen werden. Eine Möglichkeit besteht darin, den Photoresist direkt über die Maske mittels UV-Belichtung (Leiterplattenbelichter oder Halbleiterbelichter) zu belichten (UV-Tiefenlithographie) und nachfolgend zu entwickeln.The thickness of the photoresist should correspond to the thickness of the metal layer which is to be realized in the subsequent electroplating process, ie the thickness of the lower bottom layer 37 of the swirl element 25. The resist layer may consist of one or more layers of a photoimageable film or a liquid resist (polyimide, Photoresist) exist. If, optionally, a sacrificial layer is to be electroplated into the later-produced resist structures, the thickness of the photoresist is to be increased by the thickness of the sacrificial layer. The metal structure to be realized is to be transferred inversely in the photoresist by means of a photolithographic mask. One possibility is to expose the photoresist directly over the mask by means of UV exposure (printed circuit board imagesetter or semiconductor exposure device) (UV deep lithography) and subsequently to develop it.

Die letztlich im Photoresist entstehende Negativstruktur zur späteren Schicht 37 des Drallelements 25 wird galvanisch mit Metall (z. B. Ni, NiCo, NiFe, NiW, Cu) aufgefüllt (Metallabscheidung). Das Metall legt sich durch das Galvanisieren eng an die Kontur der Negativstruktur an, so dass die vorgegebenen Konturen formtreu in ihm reproduziert werden. Um die Struktur des Drallelements 25 zu realisieren, müssen die Schritte ab dem optionalen Aufbringen der Hilfsschicht entsprechend der Anzahl der gewünschten Schichten wiederholt werden, so dass bei einem dreilagigen Drallelement 25 zwei (laterales Oberwachsen) oder drei Galvanikschritte vorgenommen werden. Für die Schichten eines Drallelements 25 können auch unterschiedliche Metalle verwendet werden, die jedoch nur in einem jeweils neuen Galvanikschritt einsetzbar sind.The negative structure ultimately formed in the photoresist to the later layer 37 of the swirl element 25 is galvanically filled with metal (eg Ni, NiCo, NiFe, NiW, Cu) (metal deposition). The metal adheres to the contour of the negative structure by electroplating, so that the predetermined contours are faithfully reproduced in it. In order to realize the structure of the swirl element 25, the steps from the optional application of the auxiliary layer must be repeated in accordance with the number of desired layers, so that two (lateral overgrowths) or three electroplating steps are carried out for a three-layer swirl element 25. For the layers of a Twist elements 25, different metals can be used, but they can only be used in a new electroplating step.

Nach dem Abscheiden der oberen Einlassschicht 35 wird der verbliebene Photoresist aus den Metallstrukturen durch nasschemisches Strippen herausgelöst. Bei glatten, passivierten Trägerplatten (Substraten) lassen sich die Drallelemente 25 vom Substrat lösen und vereinzeln. Bei Trägerplatten mit guter Haftung der Drallelemente 25 wird die Opferschicht selektiv zu Substrat und Drallelement 25 weggeätzt, wodurch die Drallelemente 25 von der Trägerplatte abheben und vereinzelt werden können.After depositing the upper inlet layer 35, the remaining photoresist is dissolved out of the metal structures by wet-chemical stripping. With smooth, passivated carrier plates (substrates), the swirl elements 25 can be detached from the substrate and singulated. For carrier plates with good adhesion of the swirl elements 25, the sacrificial layer is selectively etched away to substrate and swirl element 25, whereby the swirl elements 25 can be lifted off the carrier plate and separated.

Claims (11)

  1. Fuel injection valve for fuel injection systems of internal combustion engines, in particular for the direct injection of fuel into a combustion chamber of an internal combustion engine, having a valve longitudinal axis (2), having an actuator (10, 11, 12), having a moveable valve part (5, 7), which interacts with a fixed valve seat (22) formed on a valve seat body (16) to open and close the valve, and having a swirl element (25), which is arranged downstream of the valve seat (22), has at least one inlet region (27) and at least one outlet opening (29) and has at least one swirl passage (28) upstream of the outlet opening (29), wherein a single inlet region (27) is provided centrally in the swirl element (25) and all the swirl passages (28), through which fuel can flow exclusively in the radial direction from the inside outwards, start from this single inlet region (27), characterized in that the plurality of swirl passages (28) open out in a single outlet opening (29), which is designed as an annular gap.
  2. Fuel injection valve according to Claim 1,
    characterized in that an outlet opening (23) which is directed directly onto the inlet region (27) of the swirl element (25) is provided centrally in the valve seat body (16), downstream of the valve seat (22).
  3. Fuel injection valve according to Claim 1 or 2, characterized in that the swirl element (25) is designed in disc form.
  4. Fuel injection valve according to one of Claims 1 to 3, characterized in that the swirl element (25) is secured directly to the valve seat body (16).
  5. Fuel injection valve according to one of the preceding claims, characterized in that the swirl passages (28) have a notched channel-shaped or v-shaped geometry.
  6. Fuel injection valve according to one of Claims 1 to 4, characterized in that the swirl element (25) can be produced by electrodepositon of multiple layers of metal.
  7. Fuel injection valve according to Claim 6, characterized in that the swirl element (25) has two or three layers, and the layers are built up directly on top of one another, securely bonded to one another.
  8. Fuel injection valve according to Claim 6 or 7, characterized in that the single central inlet region (27) is provided in an upper inlet layer (35), a central region (42), from which the swirl passages (28) run radially outwards, follows in a subsequent downstream swirl generation layer (36), and the outlet opening (29), which is located further towards the outside than the inlet region (27), is formed in a lower bottom layer (37).
  9. Fuel injection valve according to Claim 8, characterized in that the swirl generation layer (36) has a plurality of inner material regions (43), which are bent off so as to resemble vanes or are of arcuate or parabolic design, so that the swirl passages (28) are produced in a similarly bent form as spaces between the material regions (43).
  10. Fuel injection valve according to one of Claims 1 to 3, characterized in that the swirl element (25) is formed in a receiving part (40) secured to the valve seat body (16).
  11. Fuel injection valve according to Claim 10, characterized in that the receiving part (40) has a collar (46) which projects towards the swirl element (25), so that a space which represents the outlet opening (29) is formed between the swirl element (25) and the collar (46).
EP01982155A 2000-10-04 2001-09-27 Fuel-injection valve comprising a swirl element Expired - Lifetime EP1228306B1 (en)

Applications Claiming Priority (3)

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DE10048935 2000-10-04
DE10048935A DE10048935A1 (en) 2000-10-04 2000-10-04 Fuel injector
PCT/DE2001/003711 WO2002029244A1 (en) 2000-10-04 2001-09-27 Fuel-injection valve comprising a swirl element

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EP1228306A1 EP1228306A1 (en) 2002-08-07
EP1228306B1 true EP1228306B1 (en) 2006-03-15

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EP (1) EP1228306B1 (en)
JP (1) JP2004510915A (en)
DE (2) DE10048935A1 (en)
WO (1) WO2002029244A1 (en)

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EP1228306A1 (en) 2002-08-07
DE10048935A1 (en) 2002-04-11
JP2004510915A (en) 2004-04-08
US20030116650A1 (en) 2003-06-26
DE50109233D1 (en) 2006-05-11
WO2002029244A1 (en) 2002-04-11

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